August 4, 2019

Incident at CHARLOTTETOWN AIRPORT (Aerodrome - power failure, ATM - inaccurate aeronautical information)

At the Charlottetown, PE (CYYG) aerodrome, a commercial power outage commenced at 1759Z. Power was restored at 1853Z. Impact to operations involved the YYG 118.0 service provided through the hand-held (NICAN) transceiver, the vehicle 122.6 service provided through the Canadian Airport Authority (CAA) handheld portable radios, the 121.5 frequency being transmit (Xmit) only (no receive), and the 243.0 being transmit (Xmit) only (no receive). All other operational equipment powered by the static uninterruptible power unit (SUPU).

May 7, 2017

Incident at MONTRÉAL / PIERRE ELLIOTT TRUDEAU INTL QC (CYUL) (ATM - inaccurate aeronautical information)

While a static uninterruptible power unit (SUPU) was being replaced in the tower, an Air Transat Boeing 737-8Q8 (C-GTQF/TSC811), from Varadero, Cuba (MUVR), to Montréal/Pierre-Elliott-Trudeau, QC (CYUL), and an Air Transat Boeing 737-8Q8 (C-GTQB/TSC861), from Montego Bay, Jamaica (MKJS), to Montréal/Pierre-Elliott-Trudeau, QC (CYUL), were unable to communicate with the tower, and since they were unable to obtain a landing clearance, they overshot Runway 24R. There was a communication equipment failure.

April 24, 2017

Incident at QUÉBEC / JEAN LESAGE INTL QC (CYQB) (Aerodrome - power failure, ATM - inaccurate aeronautical information)

Total failure of the static uninterruptible power unit (SUPU) from 0653Z to 0727Z, which resulted in the unavailability of systems at the Québec (QB) tower and flight information centre (FIC). ZUL (Capitales) air traffic control (ATC) and peripheral stations (PALs) 127.85 and 124.0 were unavailable. At 0727Z, the systems began operating using the backup interruptible power unit. The SUPU was bypassed. Impact: the arrival of a Boeing 737-86N (C-GKVU/SWG609) from Cayo Coco, Cuba (MUCC), to Québec/Jean-Lesage, QC (CYQB), was delayed by approximately 20 minutes. Coordination was done with the THURSO sector, given the frequency failures in the Québec Terminal.

July 17, 2016

Incident at WINDSOR ON (CYQG) (ATM - other)

Power failure in Tower from 1440-1530Z. Operated on static uninterruptible power unit (SUPU). No impact to operatons.

July 16, 2016

Incident at WINDSOR ON (CYQG) (ATM - other)

Power failure in Tower from 1505Z to 1610Z. All appropriate agencies were notified. Remained on static uninterruptible power unit (SUPU) power for that time and used and-Held Radio (NICAN) for Tower frequency. No delays were incurred.

April 1, 2015

Incident at ROUYN-NORANDA QC (CYUY) (Aerodrome - power failure, ATM - weather observation systems, ATM - inaccurate aeronautical information)

Generalized power outage in the lookout from 1839Z to 1842Z. The static uninterruptible power unit (SUPU) was not in service due to maintenance. The extended computer display system (EXCDS), NAV CANADA auxiliary radar display system (NARDS), human weather observation system (HWOS), WIDDS, monitor/controller (MONCO) and the VHF direction-finding (VDF) service were out of service. Impact: A Goldak Airborne Surveys Piper PA-31 (C-GJBG) was not able to call either on final or off the runway at Roberval (CYRJ), QC. Confirmed off the runway once power was restored.

November 6, 2015

Incident at BH RADAR (ATM - NAVAIDS/radar)

BH Radar outage for 2 minutes. Reason is unknown, interruptible power unit (IPU) was turned on when Radar restored, no sign of Commercial or static uninterruptible power unit (SUPU) failure, Data Systems Coordinator (DSC)/ Air Traffic Controller (ATC) decided to keep Radar on CAT II.

June 24, 2015

Incident at CU Radar Site (ATM - NAVAIDS/radar)

CU RADAR power failure from 2115Z to 2116Z until static uninterruptible power unit (SUPU) was fully initiated. No operational impact.

August 26, 2015

Incident at WINNIPEG / JAMES ARMSTRONG RICHARDSON INTL MB (CYWG) (Aerodrome - power failure, ATM - NAVAIDS/radar)

A commercial power outage resulted in the Winnipeg, MB (CYWG) radar site running on an interruptible power unit (IPU). At 0028Z, the IPU failed and radar began running on the static uninterruptible power unit (SUPU). At 0100Z, the CYWG radar feed was turned off just before SUPU was exhausted. Commercial power restored at 0135Z. No significant impact to operations.

July 29, 2015

Incident at MEDICINE HAT AB (CYXH) (ATM - inaccurate aeronautical information)

Integrated Information Display System (IIDS) Static Uninterruptible Power Unit (SUPU) failure on July 29 at 1951Z. IIDS router returned to service on July 31 at 1620Z. This resulted in loss of IIDS Circuit (CCT) to Medicine Hat, AB (CYXH) Flight Service Station (FSS). Operational impact: NAV CANADA Auxiliary Radar Display System (NARDS), and Extended Computer Display System (EXCDS) were unserviceable. Loss of electronic communication with Area Control Centre (ACC) and Flight Information Centre (FIC) via EXCDS. Greatly increased workload at FSS using paper flight data strips and manually entering aircraft movements into Time Alignment Mark (TAM), using Multipurpose Information Display System (MIDS) to open/close VFR Flight Plans (FPs). No information available via Weather Data Element (WDE) Operational Information Display (OIDS).

August 30, 2014

Incident at HAMILTON ON (CYHM) (Aerodrome - visual aids, Aerodrome - power failure)

Commercial power failure. Static uninterruptible power unit (SUPU) OK and field electrical centre (FEC) diesel responded. As a result, all field lights were out for 10 seconds while 2 aircraft were taxiing in the dark.

May 17, 2014

Incident at FORT MCMURRAY AB (CYMM) (ATM - operations)

The Tower at Fort McMurray, AB (CYMM) remainded opened until 0655Z due to technicians working on Static Uninterruptible Power Unit (SUPU). No other impact on operations.

March 13, 2014

Incident at WINNIPEG / ST. ANDREWS MB (CYAV) (ATM - inaccurate aeronautical information)

Maintenance on the St. Andrews, MB (CYAV) Tower static uninterruptible power unit (SUPU) resulted in loss of all NAV CANADA Auxiliary Radar Display System (NARDS) displays, National Voice Communication System (NVCS) panels, Extended Computer Display System (EXCDS) displays as well as the wind instruments. All systems were unserviceable for approximately 8 minutes except for the wind instruments which came back online after approximately 15 minutes. Several aircraft where delayed on the ground. Aircraft already in the air were not delayed.

June 10, 2013

Incident at WINDSOR ON (CYQG) (Aerodrome - power failure, ATM - inaccurate aeronautical information)

Windsor, ON (CYQG) maintenance switched from commercial power to generator power which resulted in power outage in the Tower (10 seconds); NAV CANADA auxiliary radar display system (NARDS)/ extended computer display system (EXCDS) had to be rebooted because the static uninterruptible power unit (SUPU) did not manage the load. No operational impact.

July 2, 2013

Incident at EDMONTON / VILLENEUVE AB (CZVL) (Aerodrome - visual aids, Aerodrome - power failure)

Upon opening the Tower, it was discovered that commercial power and standby generator had failed. The Tower and all essential ATC systems were functioning on the static uninterruptible power unit (SUPU) only, but airfield lighting was not available. Commercial was restored at 1550Z.

April 27, 2012

Incident at Kelowna (Other operational incident, Aerodrome - power failure, ATM - NAVAIDS/radar)

UPDATE from ANS&A: No further action required.
Wallenstein radar outage 0026 - 0121Z. Site IPU failed during commercial power failure, site Uninterrupted Power Unit (SUPU) failed at restoration of commercial power, techs required release to repair SUPU and put into bypass. One Wesjet and several other aircraft delayed 20 to 30 minutes inbound to Kelowna (CYLW).

January 11, 2012

Incident at VICTORIA INTL BC (CYYJ) (Aerodrome - visual aids)

Power Failure, all field lighting went out for 3 seconds, Uninterrupted Power Unit (SUPU) on.

April 11, 2012

Incident at Kelowna (Aerodrome - visual aids)

The Kelowna airfield (CYLW) remote lighting panel in Penticton was unservicable. Kelowna airfield lighting left on for the approach to runway 16 at tower closure. No impact on operations. The panel was repaired at 121700z due to a SUPU u/s.

July 1, 2012

Incident at TORONTO / OSHAWA EXECUTIVE AIRPORT ON (CYOO) (Aerodrome - power failure, ATM - other)

NAV CANADA staff at Oshawa Tower reported that the Toronto (Oshawa) Municipal Airport (CYOO) experienced a supplemental power unit (SUPU) failure overnight resulting in the loss of the Oshawa AWOS and all operational tools (such as IIDS, EXCDS and communications). Ops. impact -- the Oshawa and Peterborough NDBs (OO and PQ) were unmonitored. The localizer and distance measuring equipment were also unmonitored. The SUPU was put in manual mode (commercial power with 15 second diesel back-up). All NAV CANADA systems returned and normal operations resumed. It was noted that the SUPU requires repair.

June 21, 2012

Incident at TORONTO / OSHAWA EXECUTIVE AIRPORT ON (CYOO) (Aerodrome - power failure)

NAV CANADA staff at Oshawa Tower reported that the Toronto (Oshawa) Municipal Airport (CYOO) control tower supplemental universal power unit (SUPU) failed. Ops. impact -- tower staff lost NARDS, EXCDS, OIDS and NVCS for approximately 15 minutes. NAV CANADA Technical Operations Centre (T.O.C.) staff were contacted and the SUPU was placed on bypass. No further operational impact.

April 4, 2012

Incident at TORONTO / LESTER B. PEARSON INTL ON (CYYZ) (Aerodrome - power failure, ATM - other)

NAV CANADA staff at Toronto (LBPIA) (CYYZ) Control Tower reported that an electrical power interruption occurred during planned maintenance on the Toronto Control Tower - Battery Back-up System (SUPU), affecting ILS monitoring, communications and operational displays. AC power quickly restored and systems were operating on a generator with the SUPU in bypass. No aircraft operations were affected.

March 3, 2012


At 1147Z Winnipeg FIC lost commercial power, diesel generator did not come on so running on SUPU power only. Fax machines not on SUPU power so RSC's and NOTAMs not received. Diesel generator started up at approximately 1300Z. Commercial power restored at 1302Z.

June 29, 2011

Incident at LANGLEY REGIONAL BC (CYNJ) (Communication navigation surveillance/air traffic system, ATM - other)

Commercial Power failed at 2045z. Generator failed approximately 2115z. SUPU commenced discharging. Tech Ops personnel coincidentally on site assisted in unloading SUPU to lower demand on system and maximize remaining battery life for provision of limited control service as long as practicable. System showed no indication to control staff of IPU failure and SUPU discharge state; Tech Ops personnel on site responsible for discovering critical discharge in progress. Emergency transceiver powered up, Control positions consolidated to one position, single frequency, ATIS transmitter selected off, all non-essential equipment powered down and single NARDS/EXCDS station maintained for provision of service, with preparation made for full shut down and suspension of control service if required. IPU unstable and intermittent, failed and manually restarted multiple times eventually stabilized enough to recharge SUPU Batteries, and full operating capacity reinstated. Commercial power restored approximately 2300z.

July 22, 2011

Incident at KENORA ON (CYQK) (Communication navigation surveillance/air traffic system, Aerodrome - power failure, Aerodrome - other, ATM - other)

NAV CANADA staff at Kenora Airport (CYQK) F.S.S. reported that there was a power failure resulting in the loss of the local transmit frequencies (122.2MHz, 122.6MHz, 121.5MHz and 243.0MHz) due to no IPU installed at the transmitter site and the F.S.S. frequencies having been removed from the SUPU during the Parkair installation. A handheld transceiver (NiCAN) was used for frequency 122.2MHz. Power was restored approximately four (4) minutes later at 0040Z. Ops. impact -- minimal.

March 25, 2011

Incident at TORONTO / LESTER B. PEARSON INTL ON (CYYZ) (Aerodrome - power failure)

NAV CANADA staff at Toronto ACC reported that at 0423Z, they experienced a power bump during SUPU/IPU maintenance. Ops. impact -- Toronto CAATS/RDPS were unserviceable. NARDS was on a direct feed. Toronto ACC operations were on a diesel generator only (no SUPU). Power was restored at 0724Z. Ops. impact -- none.

June 25, 2010

Incident at LANGLEY REGIONAL BC (CYNJ) (Aerodrome - visual aids, Aerodrome - power failure)

There was a general electrical failure in Langley Tower. Frequency 119.0 was available only on NICAN (emergency transmitter). Field lighting was not available. A Notice to Airmen (NOTAM) was issued. The Supplemental Uninterruptible Power Unit (SUPU) failed to start the diesel generator. Only limited service was provided.
UPDATE from ANS & Airspace: No further action required.

September 22, 2010

Incident at TORONTO / LESTER B. PEARSON INTL ON (CYYZ) (Aerodrome - other, ATM - operations)

The Toronto Area Control Centre (ACC) fire alarm activated at 0745Z due to an overheated air handler in the main floor Supplementary Uninterruptable Power Unit (SUPU) room. The Morningstar Airlines BOEING 727-200 aircraft operating as MAL7050 was taxiing out for a scheduled IFR flight from Toronto (LBPIA) (CYYZ) to Winnipeg (JARIA) (CYWG) was given a groundstop for 15 mins due to possible evacuation and then released. Toronto ACC resumed normal operations at 0800Z. No other ops. impact.

April 16, 2010

Incident at HAMILTON ON (CYHM) (Other operational incident, Aerodrome - power failure, Aerodrome - other, Aerodrome - operations)

NAV CANADA staff at Hamilton (JCMIA) (CYHM) reported that there was a complete power failure at 1736Z. The cause is believed to be the additional maintenance work on the SUPU system. This scenario is identical to the failure at 1555Z (reported as CADOR 2010O0781). The IIDS equipment returned several minutes after the power was restored and required several more minutes to set up. The remaining equipment was restored by 1800Z. There was minimal impact on operations.

Incident at HAMILTON ON (CYHM) (Other operational incident, Aerodrome - power failure, Aerodrome - operations, ATM - other)

NAV CANADA staff at Hamilton (JCMIA) (CYHM) reported that their facility experienced a complete power failure at 1555Z. NAV CANADA staff believed that work being performed on the supplemental uninterruptable power unit (SUPU) was the cause. The IIDS equipment took several minutes to return to operation and additional time to set up. Most other systems took longer. Ops. impact -- minimal.

February 26, 2009

Incident at VAL-D'OR QC (CYVO) (ATM - operations)

En raison d'un changement de configuration d'équipement du bloc d'alimentation statique sans coupure (SUPU), les heures d'exploitation de la station d'information de vol (FSS) de Val-d'Or (CYVO) ont été prolongées. À 0830Z, tout est revenu à la normale. Le système automatisé d'observations météorologiques (AWOS) a été disponible tel que publié. Aucun impact sur les opérations ATC.

April 29, 2009

Incident at VANCOUVER INTL BC (CYVR) (Other operational incident, Aerodrome - power failure)

UPDATE from Aerodrome Safety: No further action required.
A total power failure occurred in the Vancouver International Tower Cab causing a loss of all systems except backup radio and battery Light Gun. The tower was unable to communicate with some aircraft on the maneuvering area (due aircraft location) but the Airport Authority (YVRAA) was able to relay. Some departures experienced delays of less than five minutes. Power restored through generator at 1045z and systems restored by 1100z. At 1350z the Tower Cab was returned to commercial power causing a loss of all systems except backup radio and battery Light Gun. Systems restored by 1400z, no operational impact.Investigation reveals that a spike in commercial power overloaded SUPU capacitors preventing automatic transfer to or from generator power. A system is in place to prevent a repeat occurrence; permanent repair and upgrade is scheduled for May 11 & 12, 2009.

June 3, 2009

Incident at HIGH LEVEL AB (CYOJ) (Aerodrome - power failure, ATM - other)

High Level FSS reported a commercial power failure at 2020z, but all back systems worked. At 2137z the NCAMS (Aircraft Movement System) SUPU failed. Power was restored at 2202z.

March 24, 2008

Incident at PENTICTON BC (CYYF) (Aerodrome - visual aids, Aerodrome - power failure)

At 0640 Penticton FSS and Airport experienced a power failure. The FSS was on the Supplemental Uninterruptible Power Unit (SUPU) as the Airport EPU did not operate. Airport maintenance called out and had the EPU running by 0715Z. Penticton airfield lighting was unserviceable from 0640Z-0715Z. No aircraft were affected in Penticton or Kelowna Remote Aerodrome Advisory Service (RAAS). Normal power was restored at 1012Z.
UPDATE from ANS & Airspace: No further action required.

October 17, 2008

Incident at SAULT STE. MARIE ON (CYAM) (ATM - other)

Scheduled maintenance of London Airport (CYXU) ARCAL from 0400Z - 0800Z. Failure of CYXU RAAS noticed at 0438Z when Toronto ACC (YXU Sector) informed Sault Ste. Marie (CYAM) FSS that an aircraft was calling for a clearance. Local technician was informed and advised that RAAS (119.4) would probably not return until ARCAL serviceable - all agencies notified and NOTAM issued. RAAS returned to service at 0756Z.
UPDATE: From TC Inspector. London Airports was installing some metering equipment on hydro circuits in order to start charging NAV CANADA for hydro use in the terminal building. On the night in question, when the power was shut off to install the metering it appears that the bell room in the terminal building was affected. The Bell equipment for the landline for the RAAS to the Sault lost power as it was not on a SUPU circuit. This was discovered during the tower refurbishment and has since been corrected. The Bell equipment is now powered from a SUPU circuit. This was an oversight at the time of the RAAS installation. All of the NAV CANADA equipment for this installation has been on SUPU since the RAAS installation.

June 18, 2008

Incident at HAMILTON ON (CYHM) (Other operational incident, Aerodrome - visual aids, Aerodrome - operations, ATM - other)

The Cargojet Airways Ltd. Boeing 727-200 series aircraft (operating as flight CJT703) was departing on an IFR flight from Hamilton (JCMIA) (CYHM) to Toledo Express Airport, OH (U.S.A.) (KTOL). The Kelowna Flightcraft Air Charter Ltd. Boeing 727-200 series aircraft (operating as flight KFA271) was preparing to depart on an IFR flight from Hamilton (JCMIA) (CYHM) to Winnipeg (JARIA) (CYWG). CJT703 was cleared for take-off from runway 30. As CJT703 passed taxiway GOLF during its take-off roll, a power bump occurred causing the airport field lighting to recycle as the SUPU energized, resulting in approximately five (5) seconds of darkness. The aircraft rotated without incident. The flight crew did not make any comment. KFA271 was beginning to backtrack along runway 30 at the time of the power bump. The flight crew immediately stopped their aircraft when the infield lighting went out and requested further instructions. As the power returned, KFA271 was instructed to continue to backtrack. KFA271 subsequently departed without incident or further delay. Ops. impact -- unknown.

October 10, 2008

Incident at HIGH LEVEL AB (CYOJ) (Aerodrome - operations)

Unscheduled power bump (commercial power) at 0137Z. Most equipment stayed powered up due to SUPU power, however MIDS position 2 (currently the system used for Wx transmission due to an issue with the position 1 system) did not stay up on SUPU power (although it seems to be connected to the proper outlet). System was in the loading process for 0200Z weather, which was faxed to CYPE FSS as per local routing procedures. MIDS position 2 rebooted and functioning properly by 0235Z, SPECI sent to test system at 0238Z came through properly. MIDS 2 listed as master again. No impact on flight operations (no traffic in the zone throughout occurrence).

August 13, 2008


Nav Canada technicians working on the SUPU at the Fort McMurray radar site dropped the critical load and the radar failed due to the loss of power for 10 minutes.

February 27, 2008

Incident at WINNIPEG / JAMES ARMSTRONG RICHARDSON INTL MB (CYWG) (Aerodrome - power failure, ATM - other)

At 0740z Winnipeg Area Control Centre lost power to all operational systems. Power was restored approximately 10 minutes later and system restoration began immediately. Operations were fully back to normal at 1015z. Minimal impact to aircraft in-flight. Investigation is ongoing.
UPDATE ANS and Airspace reported that the failure of the Winnipeg ACC power occurred during planned AC output capacitor replacements of the ACCUPS, which was planned to occur during the ACC quiet hours. While attempting to safely test the newly installed output capacitors in an offline/offload configuration (UPU#2), the SUPU monitoring logic wrongly sensed that UPU #2 was available and attempted to load share with UPU #1. It quickly went to a hard load sharing fault and shut UPU #1 down, as UPU #2 was in fact isolated from the critical load. The original ACCUPS procurement specified an additional output breaker installation for each UPU to allow complete isolation of each UPU. Unfortunately the UPU monitoring logic was not modified to allow monitoring of this new breaker. The work crew involved with the capacitor replacement were not aware of the monitoring logic design weakness and thus used this output breaker to isolate UPU #2 from the critical load. When power was applied to the UPU #2 unit to test the newly installed capacitors offline, the monitoring logic saw the UPU #2 as available and tried to share the load with it. NAV CANADA is currently working with MGE (contractor/manufacturer of the UPU) to engineer a solution to the design limitation of the monitoring logic. When tested satisfactorily at NCTI, it will be implemented at all ACCUPS's. Additionally all TechOps management staff and facilities staff (electrical) have been briefed on the incident.

December 10, 2008

Incident at HALIFAX / STANFIELD INTL NS (CYHZ) (Aerodrome - power failure)

At 14:50Z, commercial power failed at the Halifax Control Tower, Flight Information Centre (FIC) and the airport operations building. The SUPU back-up power was operating normally until the power was restored at 16:30Z.

March 21, 2007

Incident at VICTORIA INTL BC (CYYJ) (Aerodrome - power failure, ATM - NAVAIDS/radar, ATM - ILS irregularity)

UPDATE from ANS & Airspace: No further action required.
During a run up of the external power unit by the Victoria Airport Authority, power failed to the Glide Path during the switch over for approximately 45 seconds. The failure was due to unserviceable batteries in the SUPU (Uninterrupted Power Unit). Westjet Airlines Flight WJA821, a Boeing B736 flying IFR from Calgary, was arriving on the ILS09 and lost the glidescope indication but landed safely.

January 8, 2007

Incident at PRINCE GEORGE BC (CYXS) (ATM - other, ATM - NAVAIDS/radar)

Multiple power bumps were experienced at the Baldy Hughes RADAR site at 2238Z. Site IPU responded but SUPU batteries continued to show steady discharge. Battery Almost Discharged (BAD) alarm was received at 2259Z. Site failed at 2324Z. NOTAM issued U/S til 0701082359.

March 25, 2007


The Edmonton ACC SUPU failed, which resulted in a 30 second RADAR failure. No operational impact

May 11, 2006

Incident at Centre de contrôle de Nav Canada (Aerodrome - power failure, ATM - other, ATM - operations)

A circuit breaker went off during maintenance work on the static uninterruptible power unit (SUPU) at the Montreal Control Centre, causing a general power outage and an outage of all the equipment. The centre was inoperative for 15 minutes, and resumed full operation nearly three hours later.

October 19, 2006

Incident at Mt. Wallenstein (Aerodrome - power failure, ATM - NAVAIDS/radar)

Wallenstein radar experienced a commercial power problem at 2205Z. Site IPU came on normally. SUPU battery bank started to discharge at 2239Z but IPU still showed running! Kelowna technologist was advised of the situation and the need for technical presence at the site. The site was forced to bypass (IPU operation) at 2331Z due to rapid battery discharge, and is now running on IPU only . Technologists are on the way to the site. They advise a terrible weather front passed through the area and may have taken out hydro lines up to the site. The technologist estimates 3-4 hours to the site.
UPDATE from ANS & Airspace: No further action required.

September 9, 2006


UPDATE from ANS & Airspace: No further action required.
The Vancouver Radar at Sea Island failed at approximately 0330Z. The SUPU tripped to bypass, and at the same time the site lost both ADU's feeding azimuth reference data to the Vacncouver ACC. RDPS-R would not accept the corrupt data until the ADU's were brought back on line, at which time radar service was put back online into RDPS-R at approximately 0340Z. The impact to Vancouver Terminal operations was minimal due to Victoria (CYYJ) radar coverage mosaiicing.

August 1, 2006

Incident at PRINCE RUPERT BC (CYPR) (ATM - other)

UPDATE from ANS&A: No further action required.
Tech turned on SUPU to do battery test. System did not go to battery backup as battery breaker had not been placed in the ON position. All navaids unmonitored, all frequencies U/S, all computers U/S except master MIDS. NICE DVL U/S. Problem lasted 2 min. Tech corrected problem immediately. One aircraft in zone 2 mile final on final CBY5.

February 19, 2003

Incident at VANCOUVER INTL BC (CYVR) (Other operational incident, ATM - other)

Feb 19 2006, 04:37Z - 06:25Z The Vancouver ACC Main Transmitter Site and the Backup Transmitter/ Receiver Site, located Airside at YVR, failed while Hydro repairs were being conducted to restore a downed power line. Affected equipment on Sea Island included: VR ACC Local Main Transmitters, VR ATIS frequencies and AIRINC service located at TX Site, VR ACC Local Backup Transmitters & Receivers, South Runway Wind Instruments. Prior to the Main Transmitter Site failure, AMCS indications were that the Main Tx Site AC power was unavailable and the site was running on SUPU batteries. Vancouver ACC Shift Manager and DSC were alerted of the pending failure and they arranged for ATC to switch their Operations to the Surrey ACC Backup Communications System. Traffic volume light - Minimal operational impact. Key events: 02:10 Sea Island Commercial Hydro Failure; 04:08 Main Transmitter Site - AC Power failed (as supplied by Hydro & South Powerhouse Feed); 04:37 Main Transmitter Site - complete failure; 06:25 Commercial Hydro Restored; 06:30 All affected equipment restored.

September 21, 2006

Incident at HAMILTON ON (CYHM) (Other operational incident, Aerodrome - power failure, Aerodrome - operations)

At 1510Z, the Hamilton (John C. Munro) International Airport (CYHM) control tower had a full power failure which lasted until 1530Z. At 1603Z, the power failed again (until 1610Z). Technicians were working on the SUPU during both failures. Ops. impact -- unknown. Traffic was moderate to busy during both failures.

August 7, 2006

Incident at KITCHENER / WATERLOO ON (CYKF) (Aerodrome - operations, ATM - other)

The Kitchener/Waterloo Regional Airport (CYKF) Control Tower Static Uninterruptible Power Unit (SUPU) failed overnight resulting in the loss of most of the tower equipment. Radio communication and one telephone line were available. Radar, ATIS and ILS were not available. Due to low demand, the operational impact was minimal and all equipment was restored by 1445Z.

March 5, 2006

Incident at Toronto ACC (ATM - NAVAIDS/radar)

NAV CANADA staff at Toronto ACC reported that the Radar Data Processing System (RDPS) failed while maintenance was being performed on the Supplementary Power Unit (SUPU). Traffic volume throughout the Toronto FIR was very light at the time and the impact on operations was minimal (no delays were incurred). The RDPS was fully restored at 0915Z.